[BUG] Extremely slow response times for Java code generation in Claude Code(15+ minutes)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude Code has been taking an unusually long time to generate Java code since this morning. Simple code generation tasks that typically complete in under a minute are now taking 15+ minutes.

• Switched from Opus 4.5 to Sonnet 4.5 assuming model-specific issue — same delay observed on both.
• Status page (status.anthropic.com) shows no ongoing incidents.
• Non-code conversations appear to respond normally

What Should Happen?

Claude Code should work on Java code in mere minutes like it used to before

Error Messages/Logs

<img width="890" height="150" alt="Image" src="https://github.com/user-attachments/assets/b7d29e27-61fd-4499-978e-c986301182a7" />

Steps to Reproduce

Open a conversation in claude code
Request Java code generation (e.g., simple service class, utility methods)
Observe response time

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.59

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_